karma.conf.js

/* eslint-env node */

module.exports = function(config) {
  const browsers = process.env.BROWSERS
    ? process.env.BROWSERS.split(',')
    : ['Chrome', 'Firefox'];

  config.set({
    // base path that will be used to resolve all patterns (eg. files, exclude)
    basePath: '',

    // frameworks to use
    // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
    frameworks: ['mocha', 'browserify'],

    // list of files / patterns to load in the browser
    files: ['dist/*.js', 'test/*.js'],

    // list of files to exclude
    exclude: [],

    // preprocess matching files before serving them to the browser
    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
    preprocessors: {
      'test/**/*.js': ['browserify']
    },

    browserify: {
      debug: true,
      configure: function(bundle) {
        bundle.on('prebundle', function() {
          // Exclude jsdom because it makes IE =< 8 go kaboom.
          // And browsers have real DOM, right?
          bundle.exclude('jsdom');
        });
      }
    },

    // test results reporter to use
    // possible values: 'dots', 'progress'
    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
    reporters: ['progress'],

    // web server port
    port: 9876,

    // enable / disable colors in the output (reporters and logs)
    colors: true,

    // level of logging
    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
    logLevel: config.LOG_INFO,

    // enable / disable watching file and executing tests whenever any file changes
    autoWatch: true,

    // start these browsers
    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
    browsers,

    // Continuous Integration mode
    // if true, Karma captures browsers, runs the tests and exits
    singleRun: true
  });
};